⬢In order to get the MMU2S running properly and without any issues, you MUST upgrade to the MK2.5S.
⬢Why? Well the firmware is expecting filament IR-sensor, Noctua fan, new P.I.N.D.A. sensor and other improvements, which aren't present on the MK2/S.
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And if that doesn't do the trick, you can send an inquiry to [email protected] or through the button below.